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<p>Phosphorus, a substance known for its limited mobility in soil, is commonly thought to enter groundwater through co-migration with colloids. In regions abundant in humus, like black soil, the issue of groundwater phosphorus pollution has been increasingly significant in recent years. Nevertheless, the interaction between colloids and phosphorus, as well as their connection to humus, is not yet fully understood. In this study, adsorption kinetics and aggregation dynamics experiments were conducted to comparatively analyze the dynamic effects of phosphorus adsorption by colloids and the characteristics of colloid aggregation behavior under conditions with and without the addition of humic acid, a primary component of humus. The objective of the study was to examine the impact of humic acid on the interaction between colloids and phosphorus. The kinetic behavior of phosphorus adsorption by colloids was assessed by applying the Pseudo-first-order, Pseudo-second-order, and Elovich models. The results indicated that the equilibrium adsorption capacity of phosphorus on montmorillonite without humic acid was 0.338&#xa0;mg/g and 0.336&#xa0;mg/g for 0.1&#xa0;M and 0.01&#xa0;M solutions, respectively. In contrast, for montmorillonite with humic acid, the equilibrium adsorption capacity was higher at 2.415&#xa0;mg/g and 2.078&#xa0;mg/g for the corresponding molar concentrations. Furthermore, the adsorption rate of the montmorillonite-humic acid mixture was notably accelerated, being 1.5 times faster. The critical coagulation concentration (CCC) of montmorillonite with phosphorus in a 0.1&#xa0;M NaCl solution was determined to be 27.6&#xa0;mM. Following the introduction of humic acid, the CCC increased to 83.5&#xa0;mM, indicating a reduction in the aggregation tendency of montmorillonite. Our findings suggest that in regions abundant in humus, the presence of humic acid may boost the adsorption rate and capacity of montmorillonite colloids for phosphorus while decreasing colloid aggregation. This phenomenon could potentially result in heightened co-migration of phosphorus with colloids, facilitated by improved transport mechanisms, consequently affecting groundwater quality.</p>

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Effects of Humic Acid on the Adsorption of Phosphorus by Colloids and the Kinetic Behavior of Colloid Aggregation

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Xinlin Li,
  • Simin Yao,
  • Renkuan Liao

摘要

Phosphorus, a substance known for its limited mobility in soil, is commonly thought to enter groundwater through co-migration with colloids. In regions abundant in humus, like black soil, the issue of groundwater phosphorus pollution has been increasingly significant in recent years. Nevertheless, the interaction between colloids and phosphorus, as well as their connection to humus, is not yet fully understood. In this study, adsorption kinetics and aggregation dynamics experiments were conducted to comparatively analyze the dynamic effects of phosphorus adsorption by colloids and the characteristics of colloid aggregation behavior under conditions with and without the addition of humic acid, a primary component of humus. The objective of the study was to examine the impact of humic acid on the interaction between colloids and phosphorus. The kinetic behavior of phosphorus adsorption by colloids was assessed by applying the Pseudo-first-order, Pseudo-second-order, and Elovich models. The results indicated that the equilibrium adsorption capacity of phosphorus on montmorillonite without humic acid was 0.338 mg/g and 0.336 mg/g for 0.1 M and 0.01 M solutions, respectively. In contrast, for montmorillonite with humic acid, the equilibrium adsorption capacity was higher at 2.415 mg/g and 2.078 mg/g for the corresponding molar concentrations. Furthermore, the adsorption rate of the montmorillonite-humic acid mixture was notably accelerated, being 1.5 times faster. The critical coagulation concentration (CCC) of montmorillonite with phosphorus in a 0.1 M NaCl solution was determined to be 27.6 mM. Following the introduction of humic acid, the CCC increased to 83.5 mM, indicating a reduction in the aggregation tendency of montmorillonite. Our findings suggest that in regions abundant in humus, the presence of humic acid may boost the adsorption rate and capacity of montmorillonite colloids for phosphorus while decreasing colloid aggregation. This phenomenon could potentially result in heightened co-migration of phosphorus with colloids, facilitated by improved transport mechanisms, consequently affecting groundwater quality.